ML19256A849

LER 78-069/03L-0 on 781213:while Performing Surveillance procedure,RB3-GP-2,light Did Not Illuminate When Circuit Was Tested.Relay L in Engineered Safeguards Cabinet C-4 Was de-energized,but Stuck Plunger Was in Energized Position

ML19256A849
Person / Time
Site:	Crystal River
Issue date:	12/13/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256A847	List: ML19256A846 ML19256A849
References
LER-78-069-03L, LER-78-69-3L, NUDOCS 7901160232
Download: ML19256A849 (2)

Text

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SUPPLEMENTARY INFORMATION

1. Report No.: 50-302/78-069/03L-0

2. Facility: Crystal River Unit #3

3. Report Date: 8 January 1979

4. Occurrence Date: 13 December 1978

5. Identification of Occurrence:

One inoperable engineered safety feature e,*uation system instrument channel contrary to Technical Specification 3.3.f .

6. Conditions Prior te Occurrence:

l'ade 1 power operation (99%).

7. Description of Occurrence:

At 1100 while performing Surveillance Procedure SP-130, Engineered Safeguards Monthly Functional Test, it was observed that the Reactor Building channel three, group two (RB3-GP-2) light did not illuminate when the circuit was tested. Investi-gation revealed that the contects were open on relay "L" in engineered safeguards cabinet C-4. The relay was de-energized but the plunger was stuck in the energized position. This conditiot. would have prevented channel 3 actuation of two nuclear services closed cycle cooling valves, SWV-81 and 85. Operability of channel three was promptly restored and testing continued.

8. Designation of Apparent Cause:

The cause of this event was found to be a stuck plunger in relay "L", cabinet C-4.

9. Analysis of Occurrence:

There was no hazard to plant or general public as the affected channel was in a test mode. The remaining two channels were operable.

10. Corrective Action:

The plunger in relay "L" was sprayed 71th an approved cleaner. Plunger returned to the de-engergized position. Relay operability was checked several times and found to be acceptable.

11. Failure Data:

Two similar occurrences previously reported but first occurrence of this type.

/rc

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